Improvement in piston-rods for steam-engines



10HN F. CARLL.

- Patented May 21,1872;

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UNITED PATENT Drunen.

JOHN F. OARLL, OF PLEASANTVILLE, PENNSYLVANIA.

IMPROVEMENT IN PlSTON-RODS FOR STEAM-ENGINES.

S pecfication forming part of Letters Patent No. 127,025, dated May 2l, 1F72.

SPECIFICATION.

Specification describing certain Improvements in Piston-Rods, invented by JOHN F. OARLL, of Pleasantville, county of Venango7 and State of Pennsylvania.

My invention relates more particularly to the class of piston-rods used in pumps and steam-cylinders of long stroke, which are most liable to become worn by friction, and where it is at times desirable to change the point of contact or length of stroke;l and consists in interposin g between the piston-rod and the stuffing-box or end of cylinder through which it passes, a tube or sleeve fixed in any desired position upon the piston-rod by means of a set-screw or equivalent device, and working through the stufling-box or cylinder-head, the entire friction and wear being upon the outer A suitable packing is inserted at or near the set-screw, sufficient to prevent the escape of steam or iiuid.

The drawing represents a longitudinal section of my invention, not drawn to any particular scale, as the size and proportions of the parts may vary according to the use made of them.

a represents the piston-rod, which may be of common-rolled round iron, neither turned in a lathe or polished. bis a tube or sleeve7 turned smooth on its outer surface and surrounding the piston-rod. c is a collar, of the sectional form shown, arranged to be screwed upon the upper or outer end of the sleeve b, the upper end of the collar being fitted to the rodv as accurately as it can be Without turning or polishing the latter. A shoulder is shown within the collar c, and a packing of any suitable material is inserted around the rod and held in place by and between said shoulder and the end of the sleeve b sufficient to prevent the escape of any steam or iiuid. d is a set-screw -passing through the .collar c, and above its packing, for holding the sleeve firmly at any desired point on the rod. eis the stuffing-box commonly placed upon the endof the pumptube or cylinder-head, (as the case may be,) and through which the piston-rod usually works.

It will be seen that by the use of the sleeve b no wear can come upon the piston-rod, and the latter may be raised or lowered-if in a pump-to adjust the dist-ance between valves without changing the relative positions of the wearing-surface and stuing-box e. The sleeve b, whenever worn and unfit for use, can be readily and cheaply replaced without necessitating van entire new piston-rod.

I claim as my invention- The tube or sleeve b, with its collar c, paclr- Witnesses:

J. N. CooN, R. F. DUNLAP. 

